Bats Chi-X Europe taps rival founder David Howson to take the COO reins. In the US, the SEC looks likely to choose Andrew Ceresney to take over from Robert Khuzami as enforcement director. Regulators, both “self” and the independent variety, struggle to find effective ways to regulate trading activity and reduce offenses. JLN’s “CBOE 40” anniversary celebration video is unveiled on CBOE’s web site.